Electric actuator

Abstract

Provided is an electric actuator, including: a driving motor (2); a motion conversion mechanism (6) configured to convert a rotary motion of the driving motor (2) to a linear motion; a boot (27) configured to prevent entry of a foreign substance into the motion conversion mechanism (6); and a boot cover (31) arranged so as to cover an outer side of the boot (27), wherein the boot cover (31) is formed integrally with an exterior case (8) of the electric actuator, and wherein a boot mounting member (30) having the boot (27) mounted thereto is mounted to an inner side of the boot cover (31).

The invention claimed is: 
     
       1. An electric actuator, comprising:
 a driving motor; 
 a motion conversion mechanism configured to convert a rotary motion of the driving motor to a linear motion; 
 a boot configured to prevent entry of a foreign substance into the motion conversion mechanism; and 
 a boot cover configured to cover an outer side of the boot, 
 wherein the boot cover is formed integrally with an exterior case of the electric actuator, 
 wherein a boot mounting member having the boot mounted thereto is mounted to an inner side of the boot cover so as not to move linearly due to the rotary motion of the driving motor, and 
 wherein the boot mounting member comprises an engagement claw configured to elastically deform in a radial direction to engage with the boot cover when the engagement claw is inserted into the boot cover in an axial direction. 
 
     
     
       2. The electric actuator according to  claim 1 ,
 wherein the motion conversion mechanism comprises a ball screw arranged on an axis parallel with an output shaft of the driving motor, and 
 wherein the electric actuator further comprises a transmission gear mechanism configured to transmit a driving force from the driving motor to the ball screw. 
 
     
     
       3. The electric actuator according to  claim 2 ,
 wherein the exterior case comprises:
 a motor case configured to accommodate the driving motor; and 
 an actuator case configured to support the transmission gear mechanism and the ball screw, and 
 
 wherein the boot cover is formed integrally with the motor case. 
 
     
     
       4. The electric actuator according to  claim 1 , wherein the boot is integrally joined to the boot mounting member. 
     
     
       5. The electric actuator according to  claim 1 , wherein the boot mounting member is in direct contact with the inner side of the boot cover.